Widal reaction

noun
Wi·​dal reaction
variants: also Widal's reaction \ vē-​ˈdäl(z)-​ How to pronounce Widal's reaction (audio) \

Medical Definition of Widal reaction

: a specific reaction consisting in agglutination of typhoid bacilli or other salmonellae when mixed with serum from a patient having typhoid fever or other salmonella infection and constituting a test for the disease

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